Which gland controls the function of other endocrine glands?

Appeared in: ISRO 2024

Explanation

The pituitary gland is commonly known as the "master gland" because it synthesizes and secretes tropic hormones.
These tropic hormones regulate the activity of other major endocrine glands, creating a hierarchical control system.
Key examples include Thyroid-Stimulating Hormone (TSH), which controls the thyroid gland, and Adrenocorticotropic Hormone (ACTH), which controls the adrenal cortex.

Option A: The thyroid gland is a target gland, not a controlling gland. Its hormonal secretion is regulated by the pituitary gland.
Option B: The pineal gland's primary function is to produce melatonin, which regulates circadian rhythms (the sleep-wake cycle). It does not control other endocrine glands.
Option C: The adrenal gland is also a target gland. Its cortex is controlled by Adrenocorticotropic Hormone (ACTH) from the pituitary gland.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function of the pituitary gland as the master endocrine gland as background academic context rather than a clinical decision trigger.
Dysfunction of the pituitary gland can cause widespread hormonal imbalances, leading to conditions like acromegaly (excess growth hormone), Cushing's disease (excess ACTH), or hypothyroidism (insufficient TSH).
Nurses must monitor patients with pituitary tumors or head injuries for signs of hormonal imbalance, such as changes in blood pressure, metabolism, fluid balance, and mood.
What if the question asked which structure controls the pituitary gland? The answer would be the hypothalamus, which connects the nervous system to the endocrine system and is often called the 'master of the master gland'.

How to Approach the Question

First, identify the core of the question: which gland has a primary function of controlling other glands.
Recall the basic functions of the major endocrine glands listed in the options.
Evaluate each option: The thyroid regulates metabolism, the pineal gland regulates sleep, and the adrenal gland manages stress. None of these primarily control other glands.
Recognize the pituitary gland's well-known role as the 'master gland' that secretes stimulating hormones (like TSH and ACTH) to direct the activity of other endocrine glands.
Conclude that the pituitary gland is the correct answer based on its unique regulatory function over other glands in the system.

Concept Tested & Keywords

QjwzG7sApg3fBhVsxbINbO

E6 Anatomy Applied Ashalatha 4e pp. 213-215, 223-225

E6 Histology Inderbir 11e p. 152-154

Practise the full ISRO 2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.